diff --git a/src/App/Document.cpp b/src/App/Document.cpp
index d70734bfa..1b9879ee6 100644
--- a/src/App/Document.cpp
+++ b/src/App/Document.cpp
@@ -1529,6 +1529,7 @@ DocumentObject* Document::_copyObject(DocumentObject* obj, std::map<DocumentObje
     }
 
      // unmark to be not re-computed later
+    copy->onFinishDuplicating();
     copy->purgeTouched();
     return copy;
 }
diff --git a/src/App/DocumentObject.h b/src/App/DocumentObject.h
index 48c3f6751..70a91ffe1 100644
--- a/src/App/DocumentObject.h
+++ b/src/App/DocumentObject.h
@@ -181,6 +181,8 @@ protected:
     virtual void onChanged(const Property* prop);
     /// get called after a document has been fully restored
     virtual void onDocumentRestored() {}
+    /// get called after duplicating an object
+    virtual void onFinishDuplicating() {}
 
      /// python object of this class and all descendend
 protected: // attributes
diff --git a/src/Mod/Sketcher/App/SketchObject.cpp b/src/Mod/Sketcher/App/SketchObject.cpp
index 330ff5ca6..95aa455a7 100644
--- a/src/Mod/Sketcher/App/SketchObject.cpp
+++ b/src/Mod/Sketcher/App/SketchObject.cpp
@@ -1441,6 +1441,13 @@ void SketchObject::onDocumentRestored()
     }
 }
 
+void SketchObject::onFinishDuplicating()
+{
+    Constraints.acceptGeometry(getCompleteGeometry());
+    rebuildVertexIndex();
+    onDocumentRestored();
+}
+
 void SketchObject::getGeoVertexIndex(int VertexId, int &GeoId, PointPos &PosId)
 {
     if (VertexId < 0 || VertexId >= int(VertexId2GeoId.size())) {
diff --git a/src/Mod/Sketcher/App/SketchObject.h b/src/Mod/Sketcher/App/SketchObject.h
index eef799bf7..83802d83a 100644
--- a/src/Mod/Sketcher/App/SketchObject.h
+++ b/src/Mod/Sketcher/App/SketchObject.h
@@ -152,6 +152,7 @@ protected:
     /// get called by the container when a property has changed
     virtual void onChanged(const App::Property* /*prop*/);
     virtual void onDocumentRestored();
+    virtual void onFinishDuplicating();
 
 private:
     std::vector<Part::Geometry *> ExternalGeo;